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linux_dsm_epyc7002/arch/arm64/kvm/hyp/sysreg-sr.c
Marc Zyngier 4c47eb1c18 arm64: KVM: VHE: Context switch MDSCR_EL1 
The kprobe enablement work has uncovered that changes made by
a guest to MDSCR_EL1 were propagated to the host when VHE was
enabled, leading to unexpected exception being delivered.

Moving this register to the list of registers that are always
context-switched fixes the issue.

Fixes: 9c6c356832 ("arm64: KVM: VHE: Split save/restore of registers shared between guest and host")
Cc: stable@vger.kernel.org #4.6
Reported-by: Tirumalesh Chalamarla <Tirumalesh.Chalamarla@cavium.com>
Tested-by: Tirumalesh Chalamarla <Tirumalesh.Chalamarla@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-07-23 18:07:12 +02:00

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/*
* Copyright (C) 2012-2015 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
/* Yes, this does nothing, on purpose */
static void __hyp_text __sysreg_do_nothing(struct kvm_cpu_context *ctxt) { }
/*
* Non-VHE: Both host and guest must save everything.
*
* VHE: Host must save tpidr*_el[01], actlr_el1, mdscr_el1, sp0, pc,
* pstate, and guest must save everything.
*/
static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
{
ctxt->sys_regs[ACTLR_EL1] = read_sysreg(actlr_el1);
ctxt->sys_regs[TPIDR_EL0] = read_sysreg(tpidr_el0);
ctxt->sys_regs[TPIDRRO_EL0] = read_sysreg(tpidrro_el0);
ctxt->sys_regs[TPIDR_EL1] = read_sysreg(tpidr_el1);
ctxt->sys_regs[MDSCR_EL1] = read_sysreg(mdscr_el1);
ctxt->gp_regs.regs.sp = read_sysreg(sp_el0);
ctxt->gp_regs.regs.pc = read_sysreg_el2(elr);
ctxt->gp_regs.regs.pstate = read_sysreg_el2(spsr);
}
static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
{
ctxt->sys_regs[MPIDR_EL1] = read_sysreg(vmpidr_el2);
ctxt->sys_regs[CSSELR_EL1] = read_sysreg(csselr_el1);
ctxt->sys_regs[SCTLR_EL1] = read_sysreg_el1(sctlr);
ctxt->sys_regs[CPACR_EL1] = read_sysreg_el1(cpacr);
ctxt->sys_regs[TTBR0_EL1] = read_sysreg_el1(ttbr0);
ctxt->sys_regs[TTBR1_EL1] = read_sysreg_el1(ttbr1);
ctxt->sys_regs[TCR_EL1] = read_sysreg_el1(tcr);
ctxt->sys_regs[ESR_EL1] = read_sysreg_el1(esr);
ctxt->sys_regs[AFSR0_EL1] = read_sysreg_el1(afsr0);
ctxt->sys_regs[AFSR1_EL1] = read_sysreg_el1(afsr1);
ctxt->sys_regs[FAR_EL1] = read_sysreg_el1(far);
ctxt->sys_regs[MAIR_EL1] = read_sysreg_el1(mair);
ctxt->sys_regs[VBAR_EL1] = read_sysreg_el1(vbar);
ctxt->sys_regs[CONTEXTIDR_EL1] = read_sysreg_el1(contextidr);
ctxt->sys_regs[AMAIR_EL1] = read_sysreg_el1(amair);
ctxt->sys_regs[CNTKCTL_EL1] = read_sysreg_el1(cntkctl);
ctxt->sys_regs[PAR_EL1] = read_sysreg(par_el1);
ctxt->gp_regs.sp_el1 = read_sysreg(sp_el1);
ctxt->gp_regs.elr_el1 = read_sysreg_el1(elr);
ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr);
}
static hyp_alternate_select(__sysreg_call_save_host_state,
__sysreg_save_state, __sysreg_do_nothing,
ARM64_HAS_VIRT_HOST_EXTN);
void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
{
__sysreg_call_save_host_state()(ctxt);
__sysreg_save_common_state(ctxt);
}
void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
{
__sysreg_save_state(ctxt);
__sysreg_save_common_state(ctxt);
}
static void __hyp_text __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
{
write_sysreg(ctxt->sys_regs[ACTLR_EL1], actlr_el1);
write_sysreg(ctxt->sys_regs[TPIDR_EL0], tpidr_el0);
write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0);
write_sysreg(ctxt->sys_regs[TPIDR_EL1], tpidr_el1);
write_sysreg(ctxt->sys_regs[MDSCR_EL1], mdscr_el1);
write_sysreg(ctxt->gp_regs.regs.sp, sp_el0);
write_sysreg_el2(ctxt->gp_regs.regs.pc, elr);
write_sysreg_el2(ctxt->gp_regs.regs.pstate, spsr);
}
static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
{
write_sysreg(ctxt->sys_regs[MPIDR_EL1], vmpidr_el2);
write_sysreg(ctxt->sys_regs[CSSELR_EL1], csselr_el1);
write_sysreg_el1(ctxt->sys_regs[SCTLR_EL1], sctlr);
write_sysreg_el1(ctxt->sys_regs[CPACR_EL1], cpacr);
write_sysreg_el1(ctxt->sys_regs[TTBR0_EL1], ttbr0);
write_sysreg_el1(ctxt->sys_regs[TTBR1_EL1], ttbr1);
write_sysreg_el1(ctxt->sys_regs[TCR_EL1], tcr);
write_sysreg_el1(ctxt->sys_regs[ESR_EL1], esr);
write_sysreg_el1(ctxt->sys_regs[AFSR0_EL1], afsr0);
write_sysreg_el1(ctxt->sys_regs[AFSR1_EL1], afsr1);
write_sysreg_el1(ctxt->sys_regs[FAR_EL1], far);
write_sysreg_el1(ctxt->sys_regs[MAIR_EL1], mair);
write_sysreg_el1(ctxt->sys_regs[VBAR_EL1], vbar);
write_sysreg_el1(ctxt->sys_regs[CONTEXTIDR_EL1],contextidr);
write_sysreg_el1(ctxt->sys_regs[AMAIR_EL1], amair);
write_sysreg_el1(ctxt->sys_regs[CNTKCTL_EL1], cntkctl);
write_sysreg(ctxt->sys_regs[PAR_EL1], par_el1);
write_sysreg(ctxt->gp_regs.sp_el1, sp_el1);
write_sysreg_el1(ctxt->gp_regs.elr_el1, elr);
write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr);
}
static hyp_alternate_select(__sysreg_call_restore_host_state,
__sysreg_restore_state, __sysreg_do_nothing,
ARM64_HAS_VIRT_HOST_EXTN);
void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
{
__sysreg_call_restore_host_state()(ctxt);
__sysreg_restore_common_state(ctxt);
}
void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_state(ctxt);
__sysreg_restore_common_state(ctxt);
}
void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
{
u64 *spsr, *sysreg;
if (read_sysreg(hcr_el2) & HCR_RW)
return;
spsr = vcpu->arch.ctxt.gp_regs.spsr;
sysreg = vcpu->arch.ctxt.sys_regs;
spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);
if (__fpsimd_enabled())
sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
}
void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
{
u64 *spsr, *sysreg;
if (read_sysreg(hcr_el2) & HCR_RW)
return;
spsr = vcpu->arch.ctxt.gp_regs.spsr;
sysreg = vcpu->arch.ctxt.sys_regs;
write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
}
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